.top {
	width: 780px;
	background-color: azure;
}

.banner {
	background-image: url(../img/banner.jpg);
	width: 780px;
	height: 150px;
}
.nav li{background-image: url(../img/button1.jpg);
	float: left;text-align: center;
width: 78px;
height: 33px;
line-height: 33px;
}
.nav a{color: #1B5D93;
display: block;}
.nav a:hover{background-image: url(../img/button1_bg.jpg);
position: relative;
right: 1px;
bottom: 1px;}
